Narrated Qabisah al-Hilali:

There was an eclipse of the sun in the time of the Messenger of Allah ﷺ. He came out bewildered pulling his garment, and I was in his company at Medina. He prayed two rak'ahs and stood for a long time in them. He then departed and the sun became bright. He then said: There are the signs by means of which Allah, the Exalted, produces dread (in His servants). When you see anything of this nature, then pray as you are praying a fresh obligatory prayer.

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا وُهَيْبٌ، حَدَّثَنَا أَيُّوبُ، عَنْ أَبِي قِلاَبَةَ، عَنْ قَبِيصَةَ الْهِلاَلِيِّ، قَالَ كُسِفَتِ الشَّمْسُ عَلَى عَهْدِ رَسُولِ اللَّهِ ﷺ فَخَرَجَ فَزِعًا يَجُرُّ ثَوْبَهُ وَأَنَا مَعَهُ يَوْمَئِذٍ بِالْمَدِينَةِ فَصَلَّى رَكْعَتَيْنِ فَأَطَالَ فِيهِمَا الْقِيَامَ ثُمَّ انْصَرَفَ وَانْجَلَتْ فَقَالَ " إِنَّمَا هَذِهِ الآيَاتُ يُخَوِّفُ اللَّهُ بِهَا فَإِذَا رَأَيْتُمُوهَا فَصَلُّوا كَأَحْدَثِ صَلاَةٍ صَلَّيْتُمُوهَا مِنَ الْمَكْتُوبَةِ " .